The dual descriptor: Working equations applied on electronic open-shell molecular systems

►Non-restricted working equations of the dual descriptor have been proposed. ► Total electronic density and densities of frontier molecular orbitals were used as approaches. ► Degeneration in frontier molecular orbitals has been taken into account too. ► Restricted fNS(r) and fNN(r) Fukui functions have been integrated into one analytical generalized Fukui function.